u Attach one optical probe to the EA-200, and investigate the relationship between light intensity and change in temperature.

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Activity: Operating the Equipment

￿Measuring Data

uPrepare the Temperature Measurement Setup and start temperature measurement.

uCover the system with the rain cover.

uRemembering that the mass of each of the substances is different, observe the measured change in temperature and its relationship with the specific heat.

If there is the possibility that the EA-200 might become too hot, place a shade over the EA-200 to block the sun. Note that you should put a little water into the air bottle and a little air into the seawater bottle. Doing so reduces the effect of thermal expansion inside each bottle.

Measurementasurement

￿Calculator Operation

uPerform the following operation to prepare for temperature measurement using the temperature probe.

Using E-CON

m“E-CON”w1(SETUP)c(Advan)

b(Channel)1(CH1)c1(CASIO)c(TEMP)b(°C)c1(LIST) 2w c2(CH2)c1(CASIO)c(TEMP)b(°C)c1(LIST) 3w c3(CH3)c1(CASIO)c(TEMP)b(°C)c1(LIST) 4ww c(Sample)1(NO)c1(TIMER) 360wc1(NUM) 241ww1(START)

Using a Calculator Program

Find the applicable program in the Program Library (P.2-16-4), input it into your calculator, and then run it.

uDisplay the temperature measurements.

1Air

2Seawater

3Earth

T(°C) : Temperature

t (s) : Time

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uUse the measurement results to estimate differences in air temperature between a dry inland area and a coastal area.

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u Use the specific heat values provided in the table for seawater and stone to calculate the quantity of heat absorbed by the seawater and earth in the bottles, and compare them. Consider why this value is different for each of the bottles.

u Try replacing the substances inside the bottles with other substances.

uConsider why it is impossible to determine the specific heat value from temperature changes, and to determine the ratio of specific heat between two substances.

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